Accession Number:

ADA275363

Title:

Static Fracture Behavior of a Ceramic Matrix Composite at Elevated Temperatures

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1993-12-01

Pagination or Media Count:

76.0

Abstract:

This study investigated systematically the damage initiation damage progression, and failure modes of a ceramic matrix composite, NicalonCAS, when loaded in tension at elevated temperatures in the presence of air. A cross-ply lay-up, 090 2s, was studied. The primary means of analysis were stress-strain data taken during monotonic and incremental load tests and crack density assessments. Testing was conducted at room temperature 700 deg C, and 850 deg C. The stress-strain response was consistent for monotonic and incremental loading, except for a decrease in failure load at the elevated temperatures. Initial damage progression was also consistent, but the damage leading to failure and the final failure mode at 850 deg C were different due to the oxidation of the fibers. The oxidation created a brittle interface between the fiber and matrix, which resulted in an increase in fiber pull-out at the failure surface.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE